Sparking plug for internal-combustion engines



J. P. EILJNHOUT SPARKING PLUG FOR INTERNAL COMBUSTION ENGINES Feb. 2U, 1923,

Filed Dec. 10, 1919 his W Wm W If m I, M J JPIJETJER REIJ'NHOUT, OF THE HAGUE, NETHERLANDS.

SPARRING PLUG FOR INTERNAL-COMBUSTION ENGINES.

A Application filed December 10, 1919. Serial No. 343,791.

To all whom it may concern:

Be it known that 1, JAN PIETER REIJN-I HOU'I, a" subject of the Queen of The N etherlands, residing at The Hague, Netherlands, have invented certain new and useful Improvements in Sparking Plugs for Internal- Combustion Engines, of which the following is a specification."

It is well-known in "the art that the reliability of internal combustion engines with .electric ignition mainly depends upon the operation of the. sparking plug. This operation, however, may be interfered with by the process of combustion in the cylinder,

for owing to the deposition of solid products of combustion on the sparking points the sparking may be altogether prevented.

-' Moreover, the said points, which are always made of non-precious metal such as nickel,

or nickel all ye, are subject to rapid dcterioration. by the action of the very high temperatures availing in the cylinder, and

of the acids formed in the cylinder by the combustion of the lubricant. y

Now, I have found that the above disadvantages may be completely avoided by using sparking plugs the sparking points of which are provided with a protective cover of precious metal. Exhaustive tests have proved that practically no solid products of combustion are deposited on sparking points made in accordance with my in-- vention and that said points do not burn away, whereby a perfect sparking under I have found accordance with my invention.

all conditions is ensured, which is especially valuable for air craft motors.

Preferably the precious metal is deposited on the sparking points by galvanic action. that a gold-silver-alloy is very suitable for the purpose, but platinum'also gives satisfactory results.

As a matter of course it is not absolutely necessary for the preciousmetal to be de posited by galvanic action. I may, for i11- stance, provide the sparking po1nts.with the required protecting film by immersing them in a bath of molten precious metal (alloy).

The annexed drawing illustrates a long tudinal section-of a sparking plug made in In this drawing, a are the sparking points, and b is the protective cover of precious metal thereon.

I would'emphasize-that the exact construction of the as my invention is concerned, and that my invention is applicable to electric sparking plugs of any type and construction.

at I claim as my invention is:

A spark plug for internal combustion motorshaving points of non-precious metal, each of said 'points having a protective covering composed of an alloy of gold and, silver. y,

In testimony whereof I aflix my signature.

JAN PIETER REIJ N HQUT.

plug is immaterial as far 

